http://blog.csdn.net/clever101/article/details/5334369
http://wenku.baidu.com/link?url=pP-VcLXtAIZacfEmAC7VEg1nRJkV32ol3s4W0U5YWYsqQ78234wctW_A9ECkqpJelvtWYH0OGU4leSQkDOQbTz8Baz_eTnGcRT0cH3qMA2G
http://www.cnblogs.com/honghuamin/
http://zhidao.baidu.com/link?url=V0qvetEwa8UmnSkWIBWM8jpE7Kr-gkN2V-Opqal9AFScH7M3uMn1q0mdm8UJfmYcD1-JnZAvzOKGVBE2jOYoaq
http://wenku.baidu.com/link?url=75V6wvAuIKN_AOqSCIo6780XSRN6mQ-gYpGPxXCvTZtFHTpyg2jxuuu-xhi-KaMWQOvxCKJTzyFjqo6nJQ_t9mr2mLUHvMXDxszikweUzKC
http://wenku.baidu.com/link?url=oKF5bvBZFHuzypwh_I9DUZmdtdfegrybI-FpxctcREECntSLbJpsw60WuVJF6MCWftmstxmDGvs6lul0e2O65b06Xxg8f4B0feq7K9vkrpW